Abstract
The collection properties of generalized nonimaging radiation concentrators are studied for the case of geometrical optics. The second law of thermodynamics is applied to a concentrator located at the center of a cavity radiation source. It is shown that for three-dimensional concentrators the concentration C and the angular acceptance α(θ,ϕ) obey the relation
. For cylindrical concentrators, the concentration and angular acceptance α(θ) obey the relation
. These relationships are shown to reduce to those previously known for the special case of ideal concentrators.
© 1977 Optical Society of America
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